c# - Dynamic EF Where Clause raising ArgumentNullException -


i'm trying code method that, in it's class given values of of attributes, returns filtered dbset. code, far, is:

    public ienumerable<pesquisa> pesquisas {          {             prometheusdbcontext db = new prometheusdbcontext();             var temp = db.pesquisas;              if ((this.filtro.nome != null) && (this.filtro.nome.trim() != ""))             {                 temp = (temp.where(p => sqlfunctions.patindex(this.filtro.nome, p.nome) > 0) dbset<pesquisa>);             }              if ((this.filtro.codtipopesquisa != null) && (this.filtro.codtipopesquisa.trim() != ""))             {                 temp = (temp.where(p => p.codtipopesquisa == this.filtro.codtipopesquisa.trim()) dbset<pesquisa>);             }              if ((this.filtro.idstatuspesquisa != null) && (this.filtro.idstatuspesquisa > 0))             {                 temp = (temp.where(p => p.idstatuspesquisa == this.filtro.idstatuspesquisa) dbset<pesquisa>);             }              if ((this.filtro.datacriacao_inicial != null) && (this.filtro.datacriacao_final != null))             {                 temp = (temp.where(p => (p.datacriacao >= this.filtro.datacriacao_inicial) && (p.datacriacao <= this.filtro.datacriacao_final)) dbset<pesquisa>);             }             else              {                 if (this.filtro.datacriacao_inicial != null)                 {                     temp = (temp.where(p => p.datacriacao >= this.filtro.datacriacao_inicial) dbset<pesquisa>);                 }                 if (this.filtro.datacriacao_final != null)                 {                     temp = (temp.where(p => p.datacriacao <= this.filtro.datacriacao_final) dbset<pesquisa>);                 }             }              return temp                 .include(p => p.usuario)                 .include(p => p.statuspesquisa)                 .include(p => p.tipopesquisa)                 .include(p => p.modelotermoadesao)                 .include(p => p.pacientes)                 .tolist();         }

problem is: everytime 1 of attributes filled value (i.e.: this.filtro.nome = "test" ), tolist() raises argumentnullexcpetion. ideas?

you shouldn't cast dbset @ end of each line. also, declare 

iqueryable<pesquisa> temp = db.pesuisas;  // code follows.

the reason behind although start dbset, applying operators changes type. dynamic cast returns null then.


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